Antibacterial activity of heterogeneous TiO2 and ZnO nanoparticles against Gram-positive and Gram-negative bacterial pathogens

Nor Hazliana Harun, Rabiatul Basria S.M.N. Mydin, Srimala Sreekantan, Khairul Arifah Saharudin, Yong Ling Khor, Norfatehah Basiron, Azman Seeni


Hospital-acquired infections (HAIs) are responsible for over 40% of cases in acute-care hospitals and commonly associated with catheters-associated urinary tract infections (CAUTIs). Current nanotechnology approach focus on improving the aseptic procedures for medical devices and manage the HAIs risk. TiO2 and ZnO nanoparticles (NPs) have been widely reported independently, to have a photocatalytic killing potential. The present study evaluates the antibacterial activity of heterojunction between TiO2 and ZnO NPs on several types bacterial pathogens model including Staphylococcus aureus, Enterococcus faecalis, Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa. The antibacterial screening test on TiO2/ZnO nanoparticles (NPs) were done under dark and light conditions with different molar ratio 25T75Z, 50T50Z and 75T25Z according to Clinical Laboratory Standards Institute (CLSI) guidelines MO2-A11. ZnO and TiO2/ZnO (25T75Z and 50T50Z) NPs at the highest concentration (1000μg/μL) showed mean diameters of the zones of inhibition (mm); (12.5 ± 0.58), (12.13 ± 0.85), and (7.25 ± 1.44) in dark condition. Increment in inhibition zones was obtained under light condition; (21.38 ± 0.48), (17.50 ± 1.0), and (12.38 ± 1.80). Findings from this study highlights the heterogeneous TiO2 and ZnO NPs could become a promising bacteriostatic and/or bactericidal agent to combat against the HAIs.


TiO2/ZnO nanoparticles; Hospital-acquired infections; Antibacterial activity; Bacteriostatic agent; Bactericidal agent; Biomedical Product; Biomaterial; Nanomaterial

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